enable notifications after 10seconds of start or reconnect

js/background.js

@@ -1470,8 +1470,10 @@
       serverTrustRoot: window.getServerTrustRoot(),
     };
 
-    // Whisper.Notifications.disable(); // avoid notification flood until empty
-    Whisper.Notifications.enable();
+    Whisper.Notifications.disable(); // avoid notification flood until empty
+    setTimeout(() => {
+      Whisper.Notifications.enable();
+    }, window.CONSTANTS.NOTIFICATION_ENABLE_TIMEOUT_SECONDS * 1000);
 
     if (Whisper.Registration.ongoingSecondaryDeviceRegistration()) {
       const ourKey = textsecure.storage.user.getNumber();
@@ -1643,7 +1645,12 @@
     //   scenarios where we're coming back from sleep, we can get offline/online events
     //   very fast, and it looks like a network blip. But we need to suppress
     //   notifications in these scenarios too. So we listen for 'reconnect' events.
-    // Whisper.Notifications.disable();
+    Whisper.Notifications.disable();
+
+    // Enable back notifications once most messages have been fetched
+    setTimeout(() => {
+      Whisper.Notifications.enable();
+    }, window.CONSTANTS.NOTIFICATION_ENABLE_TIMEOUT_SECONDS * 1000);
   }
   function onProgress(ev) {
     const { count } = ev;

preload.js

@@ -70,6 +70,7 @@ window.CONSTANTS = {
   MAX_MESSAGE_BODY_LENGTH: 64 * 1024,
   // Limited due to the proof-of-work requirement
   SMALL_GROUP_SIZE_LIMIT: 10,
+  NOTIFICATION_ENABLE_TIMEOUT_SECONDS: 10, // number of seconds to turn on notifications after reconnect/start of app
 };
 
 window.versionInfo = {